"Mixed-olive tapenade is available in the refrigerated deli section of many supermarkets. Use a version that is chopped, not smooth...."
INGREDIENTS
•
1/2 cup chopped mixed-olive tapenade
•
1/2 cup chopped red onion
•
1/2 cup chopped fresh basil
•
5 tablespoons extra-virgin olive oil plus additional for brushing
•
1/4 cup white balsamic vinegar
•
2 teaspoons finely grated lemon peel
•
8 1/2-inch-thick diagonal baguette slices
•
4 6-ounce ahi tuna steaks (each about 3/4 to 1 inch thick)
•
4 cups (packed) baby arugula